Lattice type grille



Aug. 29, 1950 l.. G. STONE LATTICE TYPE GRILLE Filed June 29, 1945 L. INVENToR. ,Z2/@725 5gg/gel 630726 Patented Aug. 29, 1950 UNITED STATES 'ATENT OFFICE LATTICE TYPE GRILLE Application June 29, 1945, Serial N0. y602,384

2 Claims.

The present invention relates to a lattice type grille and more particularly to a grille adapted for use with loud speakers in radio and phonograph cabinets.

In cabinets housing loud speakers as for eX- ample in radio receivers and electric phonographs, it is desired to provide a cover for the face of the loud speaker. Numerous arrangements have been attempted, some of which included a wire mesh member covered with a cloth frequently retained in position by an ornamental grille or scroll work. Where the individual areas of the loud speaker grille cloth are fairly large, it frequently occurs that the cloth becomes displaced so as to sag and become unattractive. Accordingly it is desirable to obviate this disadvantage and at the same time to provide a loud speaker opening or grille Work which is relatively simple to manufacture and which at the same time permits a certain amount of latitude or variations in design and appearance of the grille.

In accordance with the present invention it is proposed to take a sheet of material and to rout the material on one side to a certain depth and then to ront the material on the other side to at least a complementary depth so as to form openings where the grooves intersect each other. Such grille is susceptible of various dierent appearances as will subsequently become apparent.

It is therefore an object of the present invention to provide a new and improved method of fabricating a lattice type grille.

It is another object of the present invention to provide a simple economical and yet attractive lattice type grille for loud speakers.

Other and further objects of the present invention will subsequently become apparent by reference to the following description taken in connection with the accompanying drawing wherein Figure 1 is a perspective view of the application of the present invention to a cabinet such as might be used for housing a radio receiver;

Figure 2 illustrates the first step in the manufacture of a lattice type grille in accordance with the present invention;

Figure 3 illustrates the second step in the manufacture of a grille;

Figure 4 is a cross sectional view of a grille constructed in accordance with the present invention such as the grille shown in Figure l as seen in the direction of the arrows along the line 4-4; and

Figure 5 is a perspective view of a lattice type 2 grille constructed in accordance with the present invention and having a further step in the manufacture appliedthereto.

Figure l shows a cabinet Il such as a radio cabinet having a loud speaker opening provided with a grille II which illustrates the appearance of a grille constructed in accordance with the apparatus and mode of manufacture about to be described. Figure 2 shows the first step in manufacture of a grille in accordance with the present invention wherein a flat sheet of material I3 is being cut in one direction by a plurality of dado cutters I4 arranged to rout the material I3 so as to produce simultaneously a plurality of longitudinally extending recesses or grooves I5.

After the routing operation of the sheet of material I3 has been completed in accordance with the showing in Figure l wherein each of the grooves I5 preferably is cut to a depth slightly greater than half the thickness of the material I3, the next step is performed as shown in Figure 3. In Figure 3 the plurality of routing cutters I4 cut a plurality of grooves I6 in a direction at an angle to the previous grooves I5. The various grooves I6 may be of the same general arrangement as the grooves I5,'or may be of greater or lesser width. The grooves I 6 produced by the routing operation at an angle to the grooves I5 preferably are of such depth as to be slightly in excess of the depth necessary to engage the rst formed grooves I 5 thereby to form at the intersection a plurality of openings. It will be appreciated that the cuts I5 and I6 may be of different depth, the only requirement being that the second set of cuts must be sufficient to intersect the grooves formed by the iirst routing operation. It also has been found preferable in many instances to rearrange the routing cutters for the second operation so as to provide openings in the panel having an aggregate area equal to about sixty per cent of the total area of the sheet of material I3. Of course by spacing the dado cutters I4 in different manners for the diiierent cuts, various effects or designs may be produced so that the emphasis may be produced upon horizontal or vertical bars in any particular arrangement.

From the cross section view in Figure 4 it will readily be seen that the cuts or routing operation I6 intersecting the previously formed openings I5 so that rectangular openings are provided where the routing grooves I5 and I6 are arranged at right angles to each other.

If desired a grille formed in the manner illusone side of the lattice type grille is coated with an adhesive and a grille cloth is applied -toathe grille. For example such grille cloth might be applied to the back of the grillesothat aunique eect would be obtained withazbarsin one direc-'l1 tion being predominant and a lesser predomi-l nance of the bars at right anglesand still a..tloird eiect of depth showing the grille cloth. It is also contemplated to apply adhesive to one-sur.- face of the grille and place a grille cloth thereupon. :Thereaften aifjigl-or formingr'die is used. topressl inwardly the,-grill-ercloth:into-the groovesas shown in Figure fwhereinthezgrillelcloth. lll ha'slibeenrapplied to thergrillezllzand pushedrinwardlysoe'as taradhere :to :the: cross 'bars :of: lthe; grille; "-Withfthefgrilleitcorvered entirely 'buv a cioth or: fabric "as-shown in: Figurel 5, @the r grille may fbelsusediorrr ei ther` 'horizontalt for, .vertical` designizemphasis.

r 1E1o1n'"tlie: foregoing it willbefappreciatedlthatf there hasf'been providedfan, improved: lattice/type grille avhcknmay rbe madefI of any. type -I of mate rial; 'atc a'azrelat-ively f. low -manufacturing cost. Where plywood', is used'the material isrelatively easytoovorkrand' inexpensive. i: =By valyngsthe adjustment of the routing cutters many avariationssindesign maybe' obtainedf! .Thefgrillecloth whenaapplied is retainechinz` position so: as.-to.ob via-tattile possibility ofw the' clothbeing:4v stretchedoxocaiused toisagfandf beoomeunattractive.

-`-'Whiler;for1'.the 'ipurposer of 4illustrating iandfdescribngf the .present inventionfit Iflsiasfzbeenvconvenien t: torshnWn-othe #drawing a1. grille formed? with" groovesat regular:tirrteryalsand of. substantiallythsam'exsizeinnfboth `sides at right` anglesl toaeanhtother; it" isz-tof be 'understood-that such disslosuref isf-motto sloer considered. arlimitation sincef 'such'l variations` in thefapplicationvvof `the methodare contemplated" asrha've:heretoforey beenI sugges tedfandwas may'betcommensurate withtthe spirit vand scopel of the inventions-set forth-iin Vthe following? claims.

A .'This ,irwentionv is=hereby 'claimed-"eas follows l. A lattice type grille comprising a sheet of plywood having a plurality of parallel grooves on its outwardly disposed face surface to dene a plurality of parallel front bars; a plurality of parallel grooves on the back surface of the grille at a right angle to the face grooves and of a depth sufficient to intersect the grooves on the face surface to provide a 'plurality lof; openings through the grille, Withthe widthof the grooves being greater than the width of the bars to provide openings throughout the grille having an .,ggregatearea equal to about sixty per sent of the total' area of the grille to facilitate trans* mission of-soundttherethrough; and a grille cloth a'sively: securedxto'the three exposed sides o;

'extendingcacros'sthe face of the grille and adhoelle front bars ,throughout their entire area and to the forwardly exposed surfaces of the rear bars at ,1 points-:intermediate the grille openings wherebf,y

'ill

the grille cloth is supported throughout a substantial:v area-of. the. grille, and. is. :thus ,prevented romsagging.

2.-. A, lattice type .grille comprising. a. sheet Aof plywood having a plurality of parallelgrooves. on its Anutwardlyl.disposedwface .surace of. the plywoodto delinea pluralityofparallel. front bars; a pluralityb parallelgrooves..onnthe back surface,.ofvv thegril1eat a,. rightangle toflthe. tace grooves and; ofr a. depth suicient,to ,intersect .the grooves. ontheiacesurfacetp provide aplurality of. openingsthroughthe. grillenand agrille, cloth extendingzacross .the faoelof the grilleand adhesively.v secured to thenthreeexposed., sides l of the frontbarsthroughout`A their entire` area. and ,to tl1e...for.wardly exposed surfaces of: the reanbars at pointslinternfiediate,theA grille npenings .where by thegrilleeloth, is Supported throughout a. substantial. area. of. ,the grille.

GEORGE STONE..

.REFERENCES yCITED The following references are of record infthe le of;Y A'tllisepatent :v

'UNITED STATES PATENTS Number `Name Date -109,005 .Ha1l,- Nov.. 8,A 1870 .2,269,816 Hamilton a Dec. 161882 2,077,513 Buttress Apr.. 20, y1937 2,165,101 Hudson July 4,..1939 2,426,928 Gazlay Sept.. 2, 1947 

